856721135 has 8 divisors (see below), whose sum is σ = 1072764000. Its totient is φ = 655577824.

The previous prime is 856721113. The next prime is 856721167. The reversal of 856721135 is 531127658.

856721135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856721135 - 2⁶ = 856721071 is a prime.

It is a super-2 number, since 2×856721135² = 1467942206311376450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3724760 + ... + 3724989.

It is an arithmetic number, because the mean of its divisors is an integer number (134095500).

Almost surely, 2^856721135 is an apocalyptic number.

856721135 is a deficient number, since it is larger than the sum of its proper divisors (216042865).

856721135 is a wasteful number, since it uses less digits than its factorization.

856721135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7449777.

The product of its digits is 50400, while the sum is 38.

The square root of 856721135 is about 29269.7990256168. The cubic root of 856721135 is about 949.7584371964.

The spelling of 856721135 in words is "eight hundred fifty-six million, seven hundred twenty-one thousand, one hundred thirty-five".